The correct answer is: Only conclusion II follows.
The statement is: We should inform all our officers not to read newspapers during office hours – Chief Manager tells. Chief Administrator.
The first conclusion is: Reading newspapers during office hours is desirable.
This conclusion does not follow from the statement. The statement only says that the Chief Manager tells the Chief Administrator that they should inform all the officers not to read newspapers during office hours. It does not say anything about whether or not reading newspapers during office hours is desirable.
The second conclusion is: Office efficiency will not increase by stopping this.
This conclusion does follow from the statement. If the Chief Manager thinks that the officers should not read newspapers during office hours, then it is likely that he believes that doing so will decrease office efficiency.
Therefore, the correct answer is: Only conclusion II follows.